Pressure-actuated tool.



G. H. GILMAN. rnnssunn AUTUATBB Toor.. Arrmoumx r'mzn :min zo, m1.

1,053,093. l Patented Feb. 11. 1913.

UNITE@ rltrtllfhlti 'PATENT tltitl. y

GEORGE H. GILMAN, GF CLAREMONT, `llftll HAMPSHIRE, ASSIGNOR TO SULLIVANMACHINERY COMPANY, OF CLAREMNT, NEW HAMPSHIRE, A CORPORATION 0F MAINE.

PRESSURE-ACTUATED TOL.

Specification of Letters Patent.

Part-.urea nen. 'i 1,1913.

Original application filed November 13V, 1908, Serial No. 462.402.Divided and this application filed' .Timel 20, 1911 Serial No. 634,281.v

To a7! y207mm z'zf may concern: l

le it known that I, Gnocca H. (lumix, a citizen ot the United States,and residing at Claremont, county of Sullivan, and State of NewHampshire, have invented an Improvenient in Pressure-ctuated Tools. otwhich the following description, in connection with the accompanyingdrawings, is a specification, like characters on the drawingsrepresenting like parts.' l, y y' This invention relates to,t`o(`ls"fa1itl ,consists more particularly in 'the 'pri'ivision 'of animproved chuck' -ortool holder `for a pressure-actuated tool. A

This application is a division ot my prior r o-pending application.Serial No. loin-M2, tiled November lll, 1908. i

Illy invention will he best understood by reference to the `tollo wingdescription when taken in connection with the accompanying illustrationot one specific embodiment thereof, while its scope will be moreparticularly pointed out in the appended claims.

In the drawings: AFigure l lshows a plan in detail ot' the clamp for-thetool bushing; Fig. is a transverse section in elevation taken on theline Q-Q in Fig. l; Fig. 3 shows a cent-ral longitudinal section inelevation of the 'forward end of a hammer drill cylinder to which isapplied the tool bushing` and clamp shown in Figs. l and 2. 4

Referring to the drawings and the illustrated embodiment of myinvention, I have there shown a pneumatic tool, herein ot' the hammerdrill type having the cylinder l containing the hammer piston 2 which isadapted to be reciprocated and strike an impact or anvil member 3resting against. the end of the shank of acutter drill or bit -l. Thepiston hammer may be of any usual or ordinary type, the construct-ion ofthe valve and supply ports and passages being ot no material concern inconnection with thev present invention.

In the operation of a tool ot this type the point of the bit or cutteris pressed against the Work, while its opposite end receives the blowsdelivered by the piston hammer, the critter' bit being permittedlongitudinal movement in its holder and being rotatably moved from timeto time by the .rotation of thetool itself o'r through other appropriatemeans. Referring to the holder .for the cut` ter, the shank of the drill-lpreferably pas-ses thrrnigh a suitable bushing the latter having abore conforming to the cross section of the drill so as to preventrotative movement of the drill relatively to the bushing whilepermittingr its longitudinal .moven'ient To prevent either rotative orlongitudinal displacement ot the luishing, the la-tter'is held fixed inthe end of the cylinder by afkey bolt lying transversely across thebushing. The key carried in the split clamping piece 7, which is adaptedto be slipped over the end 'ot' the cylinder and clamped into positionby the key.' T he walls ofthe cylinder are transversely cut away toreceive the key, andthe latter 1s provided with an inclinedbushingengaging wall 8 adapted to seat in a corre-L spondingly shapedgroove or recess in the bushing, s0 that, when the bolt is clamped upthe key seats in the bushingrecess-and the bushing is locked rigidlyagainst displacement of any kind within the cylinder. By unloosening theclamping nut 9 the key may be moved laterally far enough'to permit theremoval of the bushing Without the withdrawal of the key from vthecylinder. Preferably, though not necessarily', the cylinder is split asat l0 for a short distance from its end, so that the bushing can beslippe l-fi-eely in and outv ot' the cylinder, while, at the same' time.it may he clamped tightly within the cvlinder when the clamping nut 9 istightened. Y

As will be seen from Figs. and 3, the external head of the key bolt isWider than the .internal portion 12 on which is formed the inclinedengaging wall 8 so that the head bears against the walls of the splitclamping piece. It will therefore be observed that the key bolt, byreason o t' its entrance into the groove or recess in the hushing, holdsthe latter positively against lon- `gitudinal or rotative movement, andat the same time contracts. and gripsv the splitclamping piece about thesplit walls ol the cylinder to cause the latter to contract and grip thebushing, a sutticient initial clearancel between the wall 8 and thebushing recess being provided to permit a suliiciently forcetul grippingaction to take place as heretotore referred to.

`While I have herein shown and described 'for the purposes oitillustration one concrete 'former-embodiment of my invention, it isto'he'und'erstood that Athe same is not limited toffthe' .details ofconstruction, or, relative form or arrangement of parts, `or to theaptplieation] @frein made of the various features vxtherebf, but thatthe same ,may be modifie Within Wide limits withoutdepartfingfromgthespirit of .the invention.

12.'. In a pressure-operated tool, t-he combination fof a' cylinderprovided With` a bushu'g-rezpeiving end portion provided with akey-receiving passage, Va piston insaid -cyliin'al thrustl from saidlpistoma bushing 'raving Aprovision t-ohold said tool non-rotative Whilepermitting longitudinalmovementthereof, and provided with aninlsaidtbushin fined'. including a clamping ,keyflocatedf 1n saidpassage, having an ex- ,ternally `seated shoulder, and a' laterally'projecting inclined-portion. located in said figf'reessf," and anuttthreadedcnto said key fordrawingv the latter into said recess.

13; In a pressure-operatedtool, the combii nation of? av cylinder'y'having la cont-ractible keyreceiving"passage, a piston, a tool saipiston, va bushinghaving provision to vhold" said tool non-rotativewhile permitting y'l ongtndinal movement thereof, saidf hush-EDfingV-being" provided lwith a lateral'recesaf andfmeans to contractsaid cylinder -tol grip thetbushingthereim including a key locatedVin'said passage and having a laterally' projecting portion located insaid recess.'

4g-In a: pressure-operated tool, the combination of-a cylinderl having acontractible bushing-receivingend port-ion provided with a'key-receiving passage, a piston, a tool 'ada ted 'to receive alongitudinal thrust from sai I' piston, a'bushing. having provision tohold said tool non-rotative While permitting longitudinalfmo'vem'entthereof, said bushmeans to contract said4 cylinder to gripthebush-ingtherein,l including a `key locatedm ide'r', a tool 'arranged toreceive a longituelinedflateral recess, and 4,means for holdingreceivlng assage a i y 'bushing-receiving end portionA provided with adated'toreceWea longitudinal thrust from ing being provided'with ala'teralrecess, and

' said passage and naving an externally seated head anda laterallyprojecting portion located in saidrecess.

5. In a pressure-operated tool, the combination of a cylinderhavingacontractible bushing-receiving endportion provided with a key receivingpassage, a piston, a tool adapted to receive a longitudinal thrust fromsaid piston, a bushing having provision to hold said toolnon-rotativeWhile permitting longitudinal movement thereof, said bushing being'provided With a lateral recess, and means to contract said cylinder togrip the 'bushing therein, including a key located in said passage andhaving an externally-seated head at one-end, a reducedscreW-threadedshank at its other end, and an intermediate laterallyprojecting portion located in said recess, and a nuthavingscrew-tln'eaded.engagement with, said shank. 85

(i. In a pressi1re-operated tool, the combination of a cylinder having abushing-receiving end portion provided With a key-receiving passagehaving an enlarged non-cyiindrical portion, 'a piston, a tool adapted 90to receive a longitudinal thrust from said piston, va loushingy havingpro-vision to hold said tool non-rotative, while permittingvlongitudinal movement thereof, said bush- ,lng bein provided with a.lateral recess, a .contracti le collar, and means to contract saidcollar to cause the bushing to be gripped, including a key having anexternally-seated head and an enlarged non-cylindrical portion locatedin said non-cylindrical' portion -of said passage andprojectincinte-said recess. f

In a pressure-operated tool, the combination of a cylinder having abushing-receiving end portion provided with a keypiston, a tool adaptedto receive a ongltudinal thrust from said piston, a bushing havingprovision to hold said tool non-rotative, while ermitting longitudinal'movement thereof? said bushing loeing `rovided with a lateral recess,al contractible collar, and meansI to contract said collarto cause thebushing to be gripped, including a key located in vsaid passage andhaving an externallyseated head at one end, a reduced screw-threadedshank at its other end, and an intermediate enlarged portion located insaid recess,l and. a nut having screwt threaded engagement- With saidshank'.

(8. In a pressure-operated tool, the comhi- 120 n ation of a cylinderhaving a contractible bushing-receiving end portion provided with akey-receiving passage, a piston, a tool f Aadapted to` receive alongitudinal thrust from said piston, a bushing having provisionto holdsaid tool non-rotative, While permitting longitudinal movement thereof,said bushing being provided with a lateral recess, and means tocontract. said cylinder i to gripl the bushing therein, including a keyhavin a laterali rojectin rtion located t[in said recesys :13ndlockiiigpsaid bushing against rotative and longitudinal movement.

9. In a pressure-operated tool, the combination of a cylinder having acontractible bushing-receiving end portion provided with a key-receivingassage having an enlarged non-cylindrical1 portion, a piston, a tooadapted to receive a longitudinal thrust from said iston, a bushinghaving provision to hod said tool nonrotatve,'whi1e permittinlongitudinal movement thereof, said bushing being provided with alateral recess, and means to contract said cylinder to grip the bushingtherein, including a key having an enlarged non-cylindrical portionlocated in said non-cylindrical portion of said assagc and projectingint/o said redplockin said bushing against rotative as well asongitudinal movement.

10. In a pressure-operated tool, the combination of a cylinder having acontract-ible bushing-receivin end portion provided with a key-receivingpassage, a piston, a tool adapted to receive a longitudinal thrust fromsaid piston, a bushing having provision to hold said tool non-rotative,while permitting longitudinal movement thereof,

Said bushing being provided with a lateral recess, and means to contractsaid cylinder to gri thea-bushing therein, including a contraeti lecollar, a key located in said passage and having an externallyseatedhead 'and 'a ortion non-rotatively engaged in said cylinder and locatedin said recess.

11. In a pressure-operated tool, the conibination of a cylinder having abushing-rt ceiving end portion provided with a non-cylindrical ke-receiving passage, a piston, a tool adapte to receive a longitudinalthrust from sald istan,l a bushing having provision to ho d said toolnon-rotative, while permitting longitudinal movement thereof, saidbushlng bein provided with a lateral recess, a contractile collar, andmeans to contract said collar to cause the bushing to be gripped,including a key. having a noncylindrical portion located in said passageand projecting into said recess.

In testimony whereof, I have signed my name to this specification, inthe presence ot' two subscribing witnesses..

GEORGE H. GILMAN.

Witnesses:

CHAS. J. JoNEs, E. J. BURCHARD.

